Estimation question

How many pizzas would you need to circle the earth at the equator?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Classic estimation using geometry and reasonable size assumptions.

State Earth's equatorial circumference, roughly 40,000 kilometers, a commonly known reference figure.
Assume a standard pizza diameter, about 30 centimeters or 0.3 meters, placed edge to edge in a line.
Convert circumference to meters: 40,000 kilometers equals 40,000,000 meters.
Divide total distance by pizza diameter: 40,000,000 divided by 0.3 gives roughly 133 million pizzas.
Sanity check the order of magnitude: tens to low hundreds of millions feels right for a global-scale line of dinner-plate-sized objects.
State the final estimate as roughly 130 to 150 million pizzas, given rounding in the assumptions.

Uses a well-known reference figure, Earth's circumference, rather than guessing it, and states it as a known constant.
Chooses a reasonable, defensible pizza size assumption and states it explicitly.
Shows the full calculation rather than jumping to an answer.
Gives a final range acknowledging the rounding involved.

Chapters of the AI PM course that teach what this question tests.